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Abstract
Cyanobacteria can rapidly regulate the relative activity of their photosynthetic complexes photosystem I and II (PSI and PSII) in response to changes in the illumination conditions. This process is known as state transitions. If PSI is preferentially excited, they go to state I whereas state II is induced either after preferential excitation of PSII or after dark adaptation. Different underlying mechanisms have been proposed in literature, in particular i) reversible shuttling of the external antenna complexes, the phycobilisomes, between PSI and PSII, ii) reversible spillover of excitation energy from PSII to PSI, iii) a combination of both and, iv) increased excited-state quenching of the PSII core in state II. Here we investigated wild-type and mutant strains of Synechococcus sp. PCC 7942 and Synechocystis sp. PCC 6803 using time-resolved fluorescence spectroscopy at room temperature. Our observations support model iv, meaning that increased excited-state quenching of the PSII core occurs in state II thereby balancing the photochemistry of photosystems I and II.
Original language | English |
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Article number | 148255 |
Journal | Biochimica et Biophysica Acta - Bioenergetics |
Volume | 1861 |
Issue number | 10 |
DOIs | |
Publication status | Published - 1 Oct 2020 |
Keywords
- Cyanobacteria
- Excited-state quenching
- State transition
- Time-resolved spectroscopy
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Dive into the research topics of 'State transitions in cyanobacteria studied with picosecond fluorescence at room temperature'. Together they form a unique fingerprint.Projects
- 1 Finished
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SE2B: Solar Energy to Biomass - Optimisation of light energy conversion in plants and microalgae
1/03/16 → 31/08/20
Project: EU research project